Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]
Consolidation	Consolidation The “Partnership,” as used herein, includes America First Multifamily Investors, L.P., its consolidated subsidiaries and consolidated variable interest entities (Note 5). All intercompany transactions are eliminated. The consolidated subsidiaries of the Partnership for the periods presented consist of: • ATAX TEBS I, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the M24 Tax Exempt Bond Securitization (“TEBS”) Financing (“M24 TEBS Financing”) with the Federal Home Loan Mortgage Corporation (“Freddie Mac”); • ATAX TEBS II, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M31 TEBS Financing” with Freddie Mac; • ATAX TEBS III, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M33 TEBS Financing” with Freddie Mac; • ATAX TEBS IV, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M45 TEBS Financing” with Freddie Mac; • ATAX TEBS Holdings, LLC, a wholly owned subsidiary of the Partnership, which has issued secured notes (“the Secured Notes”) to Mizuho Capital Markets LLC (“Mizuho”); • ATAX Vantage Holdings, LLC, a wholly owned subsidiary of the Partnership, which is committed to loan money or provide equity for the development of multifamily properties; • One wholly owned corporation (“the Greens Hold Co”), which owns 100% of The 50/50 MF Property, a real estate asset, and certain property loans; and • Lindo Paseo LLC, a wholly owned limited liability company, which owns 100% of the Suites on Paseo MF Property. The Partnership also consolidates variable interest entities (“VIEs”) in which the Partnership is deemed to be the primary beneficiary.
Impairment of Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds	Impairment of Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds The Partnership accounts for its investments in MRBs and taxable MRBs under the accounting guidance for certain investments in debt and equity securities. The Partnership's investments in these instruments are classified as available-for-sale debt securities and are reported at their estimated fair value. The net unrealized gains or losses on these investments are reflected on the Partnership's condensed consolidated statements of comprehensive income. Unrealized gains and losses do not affect the cash flow of the bonds, distributions to Unitholders, or the characterization of the interest income of the financial obligation of the underlying collateral. See Note 22 for a description of the Partnership's methodology for estimating the fair value of MRBs and taxable MRBs. The Partnership periodically reviews its MRBs and taxable MRBs for impairment. The Partnership evaluates whether unrealized losses are considered other-than-temporary impairments based on various factors including, but not necessarily limited to, the following: • The duration and severity of the decline in fair value; • The Partnership’s intent to hold and the likelihood of it being required to sell the security before its value recovers; • Adverse conditions specifically related to the security, its collateral, or both; • Volatility of the fair value of the security; • The likelihood of the borrower being able to make scheduled interest and principal payments; • Failure of the issuer to make scheduled interest or principal payments; and • Recoveries or additional declines in fair value after the balance sheet date. While the Partnership evaluates all available information, it focuses specifically on whether the security’s estimated fair value is below amortized cost. If a MRB’s estimated fair value is below amortized cost, and the Partnership has the intent to sell or may be required to sell the MRB prior to the time that its value recovers or until maturity, the Partnership will record an other-than-temporary impairment through earnings equal to the difference between the MRB’s carrying value and its fair value. If the Partnership does not expect to sell an other-than-temporarily impaired MRB, only the portion of the other-than-temporary impairment related to credit losses is recognized through earnings as a provision for credit loss, with the remainder recognized as a component of other comprehensive income. In determining the provision for credit loss, the Partnership compares the present value of cash flows expected to be collected to the MRB’s amortized cost basis. The recognition of other-than-temporary impairment, provision for credit loss, and the potential impairment analysis are subject to a considerable degree of judgment, the results of which, when applied under different conditions or assumptions, could have a material impact to the condensed consolidated financial statements. If the Partnership experiences deterioration in the values of its MRB portfolio, the Partnership may incur other-than-temporary impairments or provision for credit losses that could negatively impact the Partnership’s financial condition, cash flows, and reported earnings.
Estimates and Assumptions	Estimates and assumptions The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires the Partnership to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted in accordance with such SEC rules and regulations, although the Partnership believes that the disclosures are adequate to make the information presented not misleading. The Partnership’s condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021. These condensed consolidated financial statements and notes have been prepared consistently with the 2021 Form 10-K. In the opinion of management, all adjustments (consisting of normal and recurring accruals) necessary to present fairly the Partnership’s financial position as of March 31, 2022, and the results of operations for the interim periods presented, have been made. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. The accompanying condensed consolidated balance sheet as of December 31, 2021 was derived from the audited annual consolidated financial statements but does not contain all the footnote disclosures from the annual consolidated financial statements.
Risks And Uncertainties	Risks and Uncertainties During the first quarter of 2022, the Federal Reserve increased short-term interest rates for the first time since December 2018 and has signaled a series of future short-term interest rate increases to combat inflation in the broader economy. In addition, geopolitical conflicts have impacted the general global economic environment. These factors have caused volatility in the fixed income markets, which has impacted the value of some of the Partnership’s investment assets, particularly fixed-rate MRBs and taxable MRBs. In addition, increases in short-term interest rates will generally result in increases in the interest cost associated with variable rate debt financing arrangements. The extent to which general economic, geopolitical, and financial conditions will impact the Partnership’s financial condition or results of operations in the future is uncertain and actual results and outcomes could differ from current estimates.
Beneficial Unit Certificates ("BUCs")	Beneficial Unit Certificates (“BUCs”) The Partnership has issued BUCs representing assigned limited partnership interests to investors. Costs related to the issuance of BUCs are recorded as a reduction to partners’ capital when issued. On April 1, 2022, the Partnership effected a one-for-three reverse unit split (“Reverse Unit Split”) of its outstanding BUCs. As a result of the Reverse Unit Split, holders of BUCs received one BUC for every three BUCs owned at the close of business on April 1, 2022. All fractional BUCs created by the Reverse Unit Split were rounded to the nearest whole BUC, with any fraction equal to or above 0.5 BUC rounded up to the next higher BUC, as provided by the Partnership Agreement. Immediately prior to the Reverse Unit Split, there were 66,049,908 BUCs issued and outstanding, and immediately after the Reverse Unit Split the number of issued and outstanding BUCs decreased to approximately 22,016,636. In connection with the Reverse Unit Split, the CUSIP number for the BUCs changed to 02364V 206. The BUCs continue to trade on the Nasdaq Global Select Market under the trading symbol “ATAX.” The one-for-three Reverse Unit Split has been applied retroactively to all net income per BUC, distributions per BUC and similar per BUC disclosures for all periods presented in the Partnership’s condensed consolidated financial statements.
Restricted Unit Awards ("RUA" or "RUAs")	Restricted Unit Awards (“RUA” or “RUAs”) The Partnership’s 2015 Equity Incentive Plan (the “Plan”), as approved by the BUC holders in September 2015, permits the grant of RUAs and other awards to the employees of Greystone Manager, or any affiliate, who performs services for Greystone Manager, the Partnership or an affiliate, and members of Greystone Manager’s Board of Managers. The Plan permits total grants of RUAs of up to 1.0 million BUCs, which reflects adjustments made to the number of BUCs that may be granted under the Plan as a result of the Reverse Unit Split. RUAs have historically been granted with vesting conditions ranging from three months to up to three years. RUAs typically provide for the payment of distributions during the restriction period. The RUAs provide for accelerated vesting if there is a change in control, or upon death or disability of the participant. The Partnership accounts for forfeitures as they occur. Outstanding RUAs were adjusted on a one-for-three basis in conjunction with the Reverse Unit Split effected on April 1, 2022. The fair value of each RUA is estimated on the grant date based on the Partnership’s exchange-listed closing price of the BUCs. The Partnership recognizes compensation expense for the RUAs on a straight-line basis over the requisite vesting period. The Partnership accounts for modifications to RUAs as they occur, if the fair value of the RUAs change, there are changes to vesting conditions or the awards no longer qualify for equity classification.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, “Financial Instruments – Credit Losses (Topic 326).” ASU 2016-13 enhances the methodology of measuring expected credit losses for financial assets to include the use of reasonable and supportable forward-looking information to better estimate credit losses. ASU 2016-13 also includes changes to the impairment model for available-for-sale debt securities such as the Partnership’s MRBs and taxable MRBs. In November 2019, the FASB issued ASU 2019-10 which amended the mandatory effective dates of certain ASUs, including ASU 2016-13, based on an entity’s filing status. As a smaller reporting company, ASU 2016-13 is effective for the Partnership on January 1, 2023. The Partnership regularly assesses its assets that are within the scope of ASU 2016-13 and has determined that the GILs, taxable GIL, property loans, receivables reported within other assets, financial guarantees, financial commitments, and interest receivable related to such assets, are within the scope of ASU 2016-13. Furthermore, the Partnership has begun developing data collection processes, assessment procedures and internal controls required to implement ASU 2016-13. The Partnership will continue to develop data collection processes, assessment procedures and internal controls that will be required when it does implement ASU 2016-13, and to evaluate the impact to the Partnership's condensed consolidated financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform—Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”), which provides optional guidance for a limited period meant to ease the potential burden in accounting for, or recognizing the effects of, reform to LIBOR and certain other reference rates. The standard is effective for all entities from March 12, 2020 through December 31, 2022. ASU 2020-04 is only applicable to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform, and that were entered into or evaluated prior to January 1, 2023. The Partnership has evaluated its population of instruments indexed, either directly or indirectly, to LIBOR and is currently evaluating the impact that the adoption of ASU 2020-04 will have to the Partnership's condensed consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2022

The “Partnership,” as used herein, includes America First Multifamily Investors, L.P., its consolidated subsidiaries and consolidated variable interest entities (Note 5). All intercompany transactions are eliminated. The consolidated subsidiaries of the Partnership for the periods presented consist of:

•

ATAX TEBS I, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the M24 Tax Exempt Bond Securitization (“TEBS”) Financing (“M24 TEBS Financing”) with the Federal Home Loan Mortgage Corporation (“Freddie Mac”);

•

ATAX TEBS II, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M31 TEBS Financing” with Freddie Mac;

•

ATAX TEBS III, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M33 TEBS Financing” with Freddie Mac;

•

ATAX TEBS IV, LLC, a special purpose entity owned and controlled by the Partnership, created to hold MRBs to facilitate the “M45 TEBS Financing” with Freddie Mac;

•

ATAX TEBS Holdings, LLC, a wholly owned subsidiary of the Partnership, which has issued secured notes (“the Secured Notes”) to Mizuho Capital Markets LLC (“Mizuho”);

•

ATAX Vantage Holdings, LLC, a wholly owned subsidiary of the Partnership, which is committed to loan money or provide equity for the development of multifamily properties;

•

One wholly owned corporation (“the Greens Hold Co”), which owns 100% of The 50/50 MF Property, a real estate asset, and certain property loans; and

•

Lindo Paseo LLC, a wholly owned limited liability company, which owns 100% of the Suites on Paseo MF Property.

The Partnership also consolidates variable interest entities (“VIEs”) in which the Partnership is deemed to be the primary beneficiary.

Impairment of Mortgage Revenue Bonds and Taxable Mortgage Revenue Bonds

The Partnership accounts for its investments in MRBs and taxable MRBs under the accounting guidance for certain investments in debt and equity securities. The Partnership's investments in these instruments are classified as available-for-sale debt securities and are reported at their estimated fair value. The net unrealized gains or losses on these investments are reflected on the Partnership's condensed consolidated statements of comprehensive income. Unrealized gains and losses do not affect the cash flow of the bonds, distributions to Unitholders, or the characterization of the interest income of the financial obligation of the underlying collateral. See Note 22 for a description of the Partnership's methodology for estimating the fair value of MRBs and taxable MRBs.

The Partnership periodically reviews its MRBs and taxable MRBs for impairment. The Partnership evaluates whether unrealized losses are considered other-than-temporary impairments based on various factors including, but not necessarily limited to, the following:

•

The duration and severity of the decline in fair value;

•

The Partnership’s intent to hold and the likelihood of it being required to sell the security before its value recovers;

•

Adverse conditions specifically related to the security, its collateral, or both;

•

Volatility of the fair value of the security;

•

The likelihood of the borrower being able to make scheduled interest and principal payments;

•

Failure of the issuer to make scheduled interest or principal payments; and

•

Recoveries or additional declines in fair value after the balance sheet date.

While the Partnership evaluates all available information, it focuses specifically on whether the security’s estimated fair value is below amortized cost. If a MRB’s estimated fair value is below amortized cost, and the Partnership has the intent to sell or may be required to sell the MRB prior to the time that its value recovers or until maturity, the Partnership will record an other-than-temporary impairment through earnings equal to the difference between the MRB’s carrying value and its fair value. If the Partnership does not expect to sell an other-than-temporarily impaired MRB, only the portion of the other-than-temporary impairment related to credit losses is recognized through earnings as a provision for credit loss, with the remainder recognized as a component of other comprehensive income. In determining the provision for credit loss, the Partnership compares the present value of cash flows expected to be collected to the MRB’s amortized cost basis.

The recognition of other-than-temporary impairment, provision for credit loss, and the potential impairment analysis are subject to a considerable degree of judgment, the results of which, when applied under different conditions or assumptions, could have a material impact to the condensed consolidated financial statements. If the Partnership experiences deterioration in the values of its MRB portfolio, the Partnership may incur other-than-temporary impairments or provision for credit losses that could negatively impact the Partnership’s financial condition, cash flows, and reported earnings.

Estimates and Assumptions

Estimates and assumptions

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires the Partnership to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted in accordance with such SEC rules and regulations, although the Partnership believes that the disclosures are adequate to make the information presented not misleading.

The Partnership’s condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021. These condensed consolidated financial statements and notes have been prepared consistently with the 2021 Form 10-K. In the opinion of management, all adjustments (consisting of normal and recurring accruals) necessary to present fairly the Partnership’s financial position as of March 31, 2022, and the results of operations for the interim periods presented, have been made. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. The accompanying condensed consolidated balance sheet as of December 31, 2021 was derived from the audited annual consolidated financial statements but does not contain all the footnote disclosures from the annual consolidated financial statements.

Risks And Uncertainties

Risks and Uncertainties

During the first quarter of 2022, the Federal Reserve increased short-term interest rates for the first time since December 2018 and has signaled a series of future short-term interest rate increases to combat inflation in the broader economy. In addition, geopolitical conflicts have impacted the general global economic environment. These factors have caused volatility in the fixed income markets, which has impacted the value of some of the Partnership’s investment assets, particularly fixed-rate MRBs and taxable MRBs. In addition, increases in short-term interest rates will generally result in increases in the interest cost associated with variable rate debt financing arrangements. The extent to which general economic, geopolitical, and financial conditions will impact the Partnership’s financial condition or results of operations in the future is uncertain and actual results and outcomes could differ from current estimates.

Beneficial Unit Certificates ("BUCs")

Beneficial Unit Certificates (“BUCs”)

The Partnership has issued BUCs representing assigned limited partnership interests to investors. Costs related to the issuance of BUCs are recorded as a reduction to partners’ capital when issued. On April 1, 2022, the Partnership effected a one-for-three reverse unit split (“Reverse Unit Split”) of its outstanding BUCs. As a result of the Reverse Unit Split, holders of BUCs received one BUC for every three BUCs owned at the close of business on April 1, 2022. All fractional BUCs created by the Reverse Unit Split were rounded to the nearest whole BUC, with any fraction equal to or above 0.5 BUC rounded up to the next higher BUC, as provided by the Partnership Agreement. Immediately prior to the Reverse Unit Split, there were 66,049,908 BUCs issued and outstanding, and immediately after the Reverse Unit Split the number of issued and outstanding BUCs decreased to approximately 22,016,636. In connection with the Reverse Unit Split, the CUSIP number for the BUCs changed to 02364V 206. The BUCs continue to trade on the Nasdaq Global Select Market under the trading symbol “ATAX.” The one-for-three Reverse Unit Split has been applied retroactively to all net income per BUC, distributions per BUC and similar per BUC disclosures for all periods presented in the Partnership’s condensed consolidated financial statements.

Restricted Unit Awards ("RUA" or "RUAs")

Restricted Unit Awards (“RUA” or “RUAs”)

The Partnership’s 2015 Equity Incentive Plan (the “Plan”), as approved by the BUC holders in September 2015, permits the grant of RUAs and other awards to the employees of Greystone Manager, or any affiliate, who performs services for Greystone Manager, the Partnership or an affiliate, and members of Greystone Manager’s Board of Managers. The Plan permits total grants of RUAs of up to 1.0 million BUCs, which reflects adjustments made to the number of BUCs that may be granted under the Plan as a result of the Reverse Unit Split.

RUAs have historically been granted with vesting conditions ranging from three months to up to three years. RUAs typically provide for the payment of distributions during the restriction period. The RUAs provide for accelerated vesting if there is a change in control, or upon death or disability of the participant. The Partnership accounts for forfeitures as they occur. Outstanding RUAs were adjusted on a one-for-three basis in conjunction with the Reverse Unit Split effected on April 1, 2022. The fair value of each RUA is estimated on the grant date based on the Partnership’s exchange-listed closing price of the BUCs. The Partnership recognizes compensation expense for the RUAs on a straight-line basis over the requisite vesting period. The Partnership accounts for modifications

to RUAs as they occur, if the fair value of the RUAs change, there are changes to vesting conditions or the awards no longer qualify for equity classification.

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, “Financial Instruments – Credit Losses (Topic 326).” ASU 2016-13 enhances the methodology of measuring expected credit losses for financial assets to include the use of reasonable and supportable forward-looking information to better estimate credit losses. ASU 2016-13 also includes changes to the impairment model for available-for-sale debt securities such as the Partnership’s MRBs and taxable MRBs. In November 2019, the FASB issued ASU 2019-10 which amended the mandatory effective dates of certain ASUs, including ASU 2016-13, based on an entity’s filing status. As a smaller reporting company, ASU 2016-13 is effective for the Partnership on January 1, 2023. The Partnership regularly assesses its assets that are within the scope of ASU 2016-13 and has determined that the GILs, taxable GIL, property loans, receivables reported within other assets, financial guarantees, financial commitments, and interest receivable related to such assets, are within the scope of ASU 2016-13. Furthermore, the Partnership has begun developing data collection processes, assessment procedures and internal controls required to implement ASU 2016-13. The Partnership will continue to develop data collection processes, assessment procedures and internal controls that will be required when it does implement ASU 2016-13, and to evaluate the impact to the Partnership's condensed consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform—Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”), which provides optional guidance for a limited period meant to ease the potential burden in accounting for, or recognizing the effects of, reform to LIBOR and certain other reference rates. The standard is effective for all entities from March 12, 2020 through December 31, 2022. ASU 2020-04 is only applicable to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform, and that were entered into or evaluated prior to January 1, 2023. The Partnership has evaluated its population of instruments indexed, either directly or indirectly, to LIBOR and is currently evaluating the impact that the adoption of ASU 2020-04 will have to the Partnership's condensed consolidated financial statements.